The CAS Registry Mumber 6520-63-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 6,5,2 and 0 respectively; the second part has 2 digits, 6 and 3 respectively. Calculate Digit Verification of CAS Registry Number 6520-63: (6*6)+(5*5)+(4*2)+(3*0)+(2*6)+(1*3)=84 84 % 10 = 4 So 6520-63-4 is a valid CAS Registry Number.
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